Spin-Josephson effects in exchange coupled antiferromagnetic insulators

作     者：Yizhou Liu Gen Yin Jiadong Zang Roger K. Lake Yafis Barlas 

作者机构：Department of Electrical and Computer Engineering University of California Riverside California 92521 USA Center of Spins and Heat in Nanoscale Electronic Systems University of California Riverside California 92521 USA Department of Physics and Materials Science Program University of New Hampshire Durham New Hampshire 03824 USA Department of Physics and Astronomy University of California Riverside California 92521 USA 

出 版 物：《Physical Review B》 (凝聚态物质与材料物理学)

年 卷 期：2016年第94卷第9期

页      面：094434-094434页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

基　　金：U.S. Department of Energy, USDOE Office of Science, SC National Science Foundation, NSF, (ECCS-1408168, ECCS-1408168) Basic Energy Sciences, BES, (DE-SC0012670) 

主　　题：Antiferromagnetism Exchange interaction Micromagnetism Spin current Magnetic insulators 

摘      要：The spin superfluid analogy can be extended to include Josephson-like oscillations of the spin current. In a system of two antiferromagnetic insulators (AFMIs) separated by a thin metallic spacer, a threshold spin chemical potential established perpendicular to the direction of the Néel vector field drives terahertz oscillations of the spin current. This spin current also has a nonlinear, time-averaged component which provides a “smoking gun signature of spin superfluidity. The time-averaged spin current can be detected via the inverse spin Hall effect in a metallic spacer with large spin-orbit coupling. The physics illustrated here with AFMIs also applies to easy-plane ferromagnetic insulators. These findings may provide a new approach for experimental verification of spin superfluidity and realization of a terahertz spin oscillator.